The magnifying powerof a compound microscope is 20 and the distance between its two lenses is 30 cm when the final image is at the near point of the eye If the focal length of eye-pfece is 6.25 cm, the focal length of objective is

The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20cm. Then the focal length of the eye - piece is

The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20cm. Then the focal length of the eye - piece is

The focal lengths of the objective and eyelens of a microscope are 1.6 cm and 2.5 cm respectively. The distance between the two lenses is 21.7 cm. If the final image is formed at infinity, the distance between the object and the objective lens is :

The focal lengths of the objective and eyelens of a microscope are 1.6 cm and 2.5 cm respectively. The distance between the two lenses is 21.7 cm. If the final image is formed at infinity, the distance between the object and the objective lens is :

The focal lengths of the objective and eyelens of a microscope are 1.6 cm and 2.5 cm respectively. The distance between the two lenses is 21.7 cm. If the final image is formed at infinity, the distance between the object and the objective lens is :

A compound microscope has a magnifying power of 100 when the image is formed at infinity. The objective has focal length 0.5cm and the tube length is 6.5cm . Find the focal length of the eye-piece.